mus: Let clients set the cursor of their window.

components/mus/public/cpp/window_observer.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_MUS_PUBLIC_CPP_WINDOW_OBSERVER_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_WINDOW_OBSERVER_H_
 
 #include <vector>
 
 #include "components/mus/public/cpp/window.h"
@@ skipping 46 matching lines @@
   virtual void OnWindowClientAreaChanged(Window* window,
                                          const gfx::Insets& old_client_area) {}
 
   virtual void OnWindowViewportMetricsChanged(
       Window* window,
       const mojom::ViewportMetrics& old_metrics,
       const mojom::ViewportMetrics& new_metrics) {}
 
   virtual void OnWindowFocusChanged(Window* gained_focus, Window* lost_focus) {}
 
+  virtual void OnWindowSetPredefinedCursor(Window* window,

[sky, 2015/12/02 21:42:35]

OnWindowPredefinedCursorChanged

+                                           mojom::Cursor cursor) {}
+
   virtual void OnWindowInputEvent(Window* window,
                                   const mojom::EventPtr& event) {}
 
   virtual void OnWindowVisibilityChanging(Window* window) {}
   virtual void OnWindowVisibilityChanged(Window* window) {}
 
   // Invoked when this Window's shared properties have changed. This can either
   // be caused by SetSharedProperty() being called locally, or by us receiving
   // a mojo message that this property has changed. If this property has been
   // added, |old_data| is null. If this property was removed, |new_data| is
@@ skipping 20 matching lines @@
   virtual void OnWindowDrawnChanging(Window* window) {}
   virtual void OnWindowDrawnChanged(Window* window) {}
 
  protected:
   virtual ~WindowObserver() {}
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_WINDOW_OBSERVER_H_